Triathlon Swim Pace Calculator
Calculate triathlon swim pace per 100m for Sprint, Olympic, Half Ironman, and Ironman from total swim time.
Returns lap splits and pool distance equivalent.
How Triathlon Swim Pace Is Calculated
Swim pace is measured in minutes per 100 meters (or 100 yards) in the pool, then applied to open-water race distances. Open water is typically 5–10% slower than pool pace due to wetsuit offset, currents, sighting, and wave starts.
Swim Pace Formula:
Pace (min/100m) = Total Swim Time / (Distance in meters / 100)
Race Finish Time:
Swim Time = Pace (min/100m) × Race Distance (m) / 100
Triathlon Swim Distances:
- Sprint: 750 m
- Olympic: 1,500 m
- 70.3 (Half-Ironman): 1,900 m
- Ironman: 3,800 m
Worked Example: Pool pace: 1:45 per 100m. Racing an Olympic triathlon (1,500m):
- Pool time estimate: 1.75 min × 15 = 26.25 min
- Open water adjustment (+7%): 26.25 × 1.07 = 28.1 minutes
Pace Reference by Swimmer Level:
| Level | Pool Pace (per 100m) |
|---|---|
| Beginner | 2:15–2:45 |
| Recreational | 1:45–2:15 |
| Competitive AG | 1:20–1:45 |
| Elite amateur | 1:05–1:20 |
| Pro triathlete | 0:58–1:10 |
Wetsuit Benefit: Wetsuits improve buoyancy and reduce drag — typical improvement is 3–7 seconds per 100m (6–12 seconds/100m for less experienced swimmers).
Sighting Overhead: In open water, sighting (lifting head to see buoys) costs approximately 2–5 seconds per sight — budget for 1 sight every 8–10 strokes.